Abstract:
A memory device includes a memory cell array having a plurality of memory cells, and a page buffer unit including a plurality of page buffers configured to store a plurality of pieces of data sequentially read from some of the plurality of memory cells at different read voltage levels, respectively, and to perform a logic operation on the plurality of pieces of data, respectively. The memory device further includes a counting unit configured to count the number of memory cells that exist in each of a plurality of sections defined by the different read voltage levels, based on results of the logic operation.
Abstract:
A flash memory management method is provided. According to the method, when a request to write the predetermined data to a page to which data has been written is made, the predetermined data is written to a log block corresponding to a data block containing the page. When a request to write the predetermined data to the page again is received, the predetermined data is written to an empty free page in the log block. Even if the same page is requested to be continuously written to, the management method allows this to be processed in one log block, thereby improving the effectiveness in the use of flash memory resources.
Abstract:
A nonvolatile memory device includes a memory cell array, a data scanning unit, and a program unit. The memory cell array includes a plurality of memory cells, where each of the memory cells is programmable to store data have a first logic value or a second logic value. The data scanning unit is configured to search among a plurality of data to be programmed in the memory cells to identify data having the second logic value. The program unit is configured to group the identified data having the second logic value, and to program at least a portion of the group of identified data at a same time into the memory cells.
Abstract:
A trim circuit comprises a trim code storage unit, a global latch unit and a local latch unit. The trim code storage unit stores a plurality of trim codes and outputs a sensing code in response to an address signal. The global latch unit latches a calibrated code or the sensing code to generate a global output signal. The calibrated code is generated by performing a calibration on the sensing code. The local latch unit repeatedly latches the global output signal in response to the address signal to generate a plurality of trim output signals.
Abstract:
A method of reading data in a non-volatile memory device based on the logic level of a selection bit of an address, determines an order of reading a first and second bits of data stored in one multi-level memory cell corresponding to the address based on the logic level of the selection bit, and senses and outputs the first and second bits of data according to the determined order of reading. The method of reading data in a non-volatile memory device and the method of inputting and outputting data in a non-volatile memory device may reduce the initial read time by selecting the order of reading the first and second bits of data stored in the multi-level memory cell and reading the data according the order based on the start address.
Abstract:
A test system includes a memory device having a data I/O circuit connected to a data write-in path and a data read-out path. During test mode, the data I/O circuit retains a copy of test pattern data received in the I/O circuit via the data write-in path as output test data before the test pattern data is stored in a memory cell array as write data. The test system also includes a test device generating the test pattern data, receiving the output test data from the memory device, comparing the output test data with the test pattern data, and generating an error detection signal on the basis of the comparison. The error detection signal indicates the presence or absence of a defect in the data write-in or read-out path.
Abstract:
Provided is a semiconductor memory device for simultaneously programming a plurality of banks. The semiconductor memory device includes: a memory cell array comprising a plurality of banks; a plurality of data buffers storing a plurality of pieces of program data to be programmed in the corresponding banks; and a plurality of scan latches configured to scan the plurality of program data transmitted from the corresponding data buffers, and configured to generate 1st through n−1th sub program data, n being a natural number greater than 2.
Abstract:
Disclosed are a non-volatile memory device and a method of programming the same. The method comprises applying a wordline voltage, a bitline voltage, and a bulk voltage to a memory cell during a plurality of program loops. In cases where the bitline voltage falls below a first predetermined detection voltage during a current program loop, or the bulk voltage becomes higher than a second predetermined detection voltage, the same wordline voltage is used in the current programming loop and a next program loop following the current program loop. Otherwise, the wordline voltage is incremented by a predetermined amount before the next programming loop.
Abstract:
Disclosed is a non-volatile memory device and a method of programming the same. The non-volatile memory device comprises a plurality of memory cells that are programmed by supplying first and second program voltages thereto. In cases where the second program voltage rises above a predetermined detection voltage, the first program voltage is prevented from being supplied to the memory cell until the second program voltage falls below the detection voltage.
Abstract:
A method of programming a selected cell in a multi-level flash memory device comprises determining whether to program an upper bit or a lower bit of a selected memory cell, detecting a current logic state of two bits of data stored in the selected memory cell, determining a target logic state for the upper or lower bit, generating a program voltage and a verify voltage for programming the upper or lower bit to the target logic state, and applying the program voltage and the verify voltage to a word line connected to the selected memory cell.